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| Commit | Line | Data |
|---|---|---|
| 051b1e55 | 1 | #ifndef lint |
| 3bc5312c | 2 | static char sccsid[] = "@(#)gcd.c 5.3 (Berkeley) %G%"; |
| 051b1e55 | 3 | #endif not lint |
| c3a0d10b SL |
4 | |
| 5 | #include <mp.h> | |
| 6 | gcd(a,b,c) MINT *a,*b,*c; | |
| 7 | { MINT x,y,z,w; | |
| 8 | x.len=y.len=z.len=w.len=0; | |
| 9 | move(a,&x); | |
| 10 | move(b,&y); | |
| 11 | while(y.len!=0) | |
| 12 | { mdiv(&x,&y,&w,&z); | |
| 13 | move(&y,&x); | |
| 14 | move(&z,&y); | |
| 15 | } | |
| 16 | move(&x,c); | |
| 17 | xfree(&x); | |
| 18 | xfree(&y); | |
| 19 | xfree(&z); | |
| 20 | xfree(&w); | |
| 21 | return; | |
| 22 | } | |
| 23 | invert(a, b, c) MINT *a, *b, *c; | |
| 24 | { MINT x, y, z, w, Anew, Aold; | |
| 25 | int i = 0; | |
| 26 | x.len = y.len = z.len = w.len = Aold.len = 0; | |
| 27 | Anew.len = 1; | |
| 39120317 | 28 | Anew.val = xalloc(1, "invert"); |
| c3a0d10b SL |
29 | *Anew.val = 1; |
| 30 | move(b, &x); | |
| 31 | move(a, &y); | |
| 32 | while(y.len != 0) | |
| 33 | { mdiv(&x, &y, &w, &z); | |
| 34 | move(&Anew, &x); | |
| 35 | mult(&w, &Anew, &Anew); | |
| 36 | madd(&Anew, &Aold, &Anew); | |
| 37 | move(&x, &Aold); | |
| 38 | move(&y, &x); | |
| 39 | move(&z, &y); | |
| 40 | i++; | |
| 41 | } | |
| 42 | move(&Aold, c); | |
| 43 | if( (i&01) == 0) msub(b, c, c); | |
| 44 | xfree(&x); | |
| 45 | xfree(&y); | |
| 46 | xfree(&z); | |
| 47 | xfree(&w); | |
| 48 | xfree(&Aold); | |
| 49 | xfree(&Anew); | |
| 50 | } |